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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7361406 | Ultra-high current density thin-film Si diode A combination of a thin-film μc-Si and a-Si:H containing diode structure characterized by an ultra-high current density that exceeds 1000 A/cm2, comprising: a substrate; a bottom metal layer disposed on the substrate; an n-layer of μc-Si deposited the b... | 04/22/2008 |
| 7265711 | High-frequency oscillator, high-frequency transmission-reception apparatus using the same, radar apparatus, and radar-apparatus-equipped vehicle and small boat equipped with the same A high-frequency oscillator that can tune oscillation characteristics is provided. A high-frequency oscillator includes a Gunn diode serving as a high-frequency oscillation element that generates high-frequency signals, a resonator connected to the Gunn diode, a var... | 09/04/2007 |
| 7190108 | Methods and apparatus using pulsed and phased currents in parallel plates, including embodiments for electrical propulsion First and second parallel conducting plates include arrayed conducting segments, preferably with specific spacing relative to each other and to the separation of the plates. Currents through the conducting segments are pulsed and phased to produce constructive but u... | 03/13/2007 |
| 7085872 | High frequency bus system A high frequency bus system which insures uniform arrival times of high-fidelity signals to the devices on the high frequency bus, despite the use of the bus on modules and connectors. A high frequency bus system includes a first bus segment having one or more devic... | 08/01/2006 |
| 7071811 | High performance voltage control diffusion resistor The present invention provides a diffusion resistor that is formed in the substrate. A diffusion region is formed within the substrate that contains a first and second contact region. These contact regions extend downward from the surface of the substrate. A third c... | 07/04/2006 |
| 7061094 | Multilayer printed circuit board including first and second signal traces and a first ground trace A multilayer printed circuit board (PCB) includes a substrate; a ground layer having edges which define a gap portion, the ground layer being provided on a bottom face of the substrate; and at least two signal traces and provided on a top face of the substrate so as... | 06/13/2006 |
| 6919776 | Traveling wave device for combining or splitting symmetric and asymmetric waves A traveling wave device for the combining or splitting of symmetric and asymmetric traveling wave energy includes a feed waveguide for traveling wave energy, the feed waveguide having an input port and a launching port, a reflector for coupling wave energy between t... | 07/19/2005 |
| 6799027 | Amplifier circuit An amplifier circuit for amplifying an input signal to generate an amplifier output signal incorporates a cascaded series of reflection amplifiers arranged along a signal path and operative to amplify signals propagating in a forward direction along the signal path.... | 09/28/2004 |
| 6650173 | Programmable voltage generator The voltage generator comprises a negative feedback loop including a programmable voltage divider having a feedback node. The voltage divider comprises a programmable resistor disposed between the output of the voltage generator and the feedback node and ... | 11/18/2003 |
| 6603956 | Radio repeater using the non-radiative dielectric waveguide A radio repeater wherein a reflective negative resistance amplifier, using the negative resistance of a Gunn diode, is applied at one side of a dielectric waveguide, enabling signals to be inputted through the input terminal dielectric waveguide, circulat... | 08/05/2003 |
| 6414551 | Multi-space structure amplifier A high frequency amplifier with the multi-space structure, amplifying various frequencies by a Gunn diode in the multi-space structure, composed of non-radiative dielectric waveguides of various different sizes. An amplifier circuit includes a Gunn diode ... | 07/02/2002 |
| 5446426 | Microwave power combiner A microwave power combiner is formed in a cylindrical hollow metallic housing utilizing a number of pie shaped chambers formed with metallic vanes attached to and extending radially inward from the interior sidewalls of the cylindrical hollow metallic hou... | 08/29/1995 |
| 5291650 | Method of providing a integrated waveguide combiner A microwave power combiner includes a first plate having disposed in a first surface thereof a first plurality of grooves and a second plate having disposed in a first surface of said second plate a second plurality of grooves, with said second plate bein... | 03/08/1994 |
| 5229728 | Integrated waveguide combiner A microwave power combiner includes a first plate having disposed in a first surface thereof a first plurality of grooves and a second plate having disposed in a first surface of said second plate a second plurality of grooves, with said second plate bein... | 07/20/1993 |
| 4902985 | Microwave reflectiion amplifiers having increased bandwidth A four diode reflection amplifier having a relatively wide bandwidth of at least 5 percent over the frequency range of 43.5 to 45.5 GHz includes three magic Ts arranged to provide a 4-way passive power combiner. The 4-way passive power combiner symmetrica... | 02/20/1990 |
| 4853650 | Symmetric waveguide junction combiner A microwave power combiner having a spherical region from which six rectangular waveguides extend oppositely along mutually orthogonal diameters. The long dimension of each waveguide cross section extends along a diagonal of a cube circumscribing the regi... | 08/01/1989 |
| 4825175 | Broadband, high isolation radial line power divider/combiner Disclosed is a power divider/combiner using two parallel plate radial transmission lines having parallel plate spacing of less than λ/2 and which operates in a higher order mode, preferably the first higher order circumferential mode TE11. Hig... | 04/25/1989 |
| 4814729 | Precisely tunable impatt diode module for weather radar apparatus A microstrip IMPATT circuit tuning mechanism for use with RF producing IMPATT diode combinations including a microstrip circuit board and a external load line connected by a coupling spring attached to the load line and separated from the microstrip circu... | 03/21/1989 |
| 4812782 | Non-reactive radial line power divider/combiner with integral mode filters Disclosed is a parallel plate radial transmission line having parallel plate spacing of less than λ/2 and which utilizes a specific higher order mode, preferably the first higher order circumferential mode. Undesired modes are suppressed by mode supressi... | 03/14/1989 |
| 4706041 | Periodic negative resistance microwave structures and amplifier and oscillator embodiments thereof Structures (30) with IMPATT type diodes (34) located periodically along a transmission line (38-32) to simulate a distributed diode are disclosed. Preferred embodiments include incorporation of the periodic diode structures as the gain element of microwav... | 11/10/1987 |
| 4656438 | Power combining cavity A method and arrangement for enhancing the level of supplied microwave energy including a resonant ring capacitively coupled to a microwave coupling device effective for connecting to a microwave transmission line, the arrangement being mounted in a shiel... | 04/07/1987 |
| 4623849 | Broadband high power IMPATT amplifier circuit An IMPATT diode mounted in a double-tuned resonant cavity to exhibit stability by suppressing subharmonic frequencies is disclosed. A foreshortened quarter wavelength section is connected to the diode to form an equivalent parallel resonant circuit at one... | 11/18/1986 |
| 4600894 | Planar radial resonator oscillator/amplifier An apparatus and method is disclosed for providing a planar disc resonator oscillator/amplifier which consists of a planar radial disc resonator, a substrate having a hole extending therethrough, a negative impedance device, and a conductor having a prede... | 07/15/1986 |
| 4571555 | Re-entrant coaxial cavity power combiner A plurality of negative resistance devices is spaced below a cylindrical center conductor of a single coaxial cavity. Each negative resistance device has a bias device connected to it by a bias wire. Extending radially through the outer wall of the coaxia... | 02/18/1986 |
| 4539528 | Two-port amplifier A two-port monolithic microwave amplifier, which uses a distributed negative resistance diode with gain (such as an IMPATT diode) as an active element. The diode is tapered (increasing in width but not in thickness) so that, as the RF signal propagates al... | 09/03/1985 |
| 4535302 | Microwave amplifier An improved microwave amplifier is shown to comprise an IMPATT diode in a coaxial circuit coupled to a section of double-ridged waveguide forming a resonant cavity with a low Q, such cavity in turn being coupled to outside circuitry through a compound iri... | 08/13/1985 |
| 4525732 | Distributed IMPATT structure In a distributed IMPATT structure, power is coupled out through a side contact. That is, in previously proposed distributed IMPATT structures the gain medium (the active region of the IMPATT) operates as a transmission line. The prior art has attempted to... | 06/25/1985 |
| 4517527 | Waveguide amplifier circuit A waveguide amplifier circuit has two semiconductor amplifier elements in a first waveguide circuit, a second waveguide circuit which is perpendicular to the first waveguide circuit and a termination circuit arranged at an end, remote from the semiconduct... | 05/14/1985 |
| 4503404 | Primed microwave oscillator A primed oscillator for microwave amplification includes a single tank conductor (16) coupled to a coupling conductor (17) by an interdigitated coupler (26). The coupling conductor (17) is connected to the cathode of an IMPATT diode (22) which is triggere... | 03/05/1985 |
| 4468633 | Adjustable microwave power combiner for a plurality of coaxially mounted impatt diodes A typical coaxial circuit which couples a negative resistance diode to the cavity of a power combiner consists of a metallic rod which is biased by a spring against the diode supported by a carrier which is effective to vary the position of the diode alon... | 08/28/1984 |
| 4431974 | Easily tuned IMPATT diode module An improved microwave circuit is disclosed for enabling impedance tuning for power coupling in IMPATT diode and other similar oscillator and amplifier circuits. An electrically conductive support plate forming a ground plane is machined to form a channel ... | 02/14/1984 |
| 4415867 | Hybrid coupled microstrip amplifier A microstrip integrated circuit reflection amplifier utilizing packaged diodes and permitting some gain and bandwidth adjustment. A 3 db quadrature coupler has two of its ports connected to substantially identical reflection amplifiers. The reflection dio... | 11/15/1983 |
| 4359700 | Balancing network for microwave power combiner The diode bias input terminals of an IMPATT microwave power combiner are resistively coupled to a common floating node to provide stabilization of the operating points of the individual IMPATT diodes, thus minimizing the tendency of the diodes to contribu... | 11/16/1982 |
| 4316160 | Impedance transforming hybrid ring An impedance transforming hybrid ring has a non-uniform impedance ring structure coupled to four ports. Two of the ports function as input ports, the remaining two as output ports. An arbitrary relationship exists between the impedance of the input ports ... | 02/16/1982 |
| 4307349 | Impatt amplifiers A protection circuit for an Impatt amplifier includes a voltage comparator which is arranged to sense the terminal voltage of the or each Impatt diode. When the comparator senses that a diode terminal voltage has risen above a predetermined value a circui... | 12/22/1981 |
| 4291279 | Microwave combiner assembly A microwave combiner assembly is described incorporating a coaxial transmission line having a plurality of diodes exhibiting negative resistance at high frequency mounted between the center conductor and the outer conductor of the transmission line. Each ... | 09/22/1981 |
| 4282492 | Modular multiple channel signal processor A multiple channel amplifier providing both gain and/or phase shift to a microwave signal is formed of a set of transmission lines connected in parallel by means of a power splitter at the input end and a power combiner at the output end of the set of tra... | 08/04/1981 |
| 4270099 | Circuit arrangement for generating and stably amplifying broadband rf signals A circuit arrangement for generating and stably amplifying broadband rf signals. The circuit arrangement includes a first rectangular waveguide designed for operation in a frequency range below its cutoff frequency and a second rectangular waveguide for o... | 05/26/1981 |
| 4249149 | Ultra high-frequency circuit with resonant cavity equipped with pairs of peripheral diodes A circuit capable of providing the negative resistance heart of oscillators or amplifiers in the 5-20 Gc/s frequency band, comprising a central resonant cavity and one or several peripheral exciting chambers, each containing a push-pull arrangement of two... | 02/03/1981 |
| 4242644 | Pulse modulator for operating a device in the avalanche mode An impatt diode in a radio frequency circuit is pulse modulated by a circuit comprising a constant current source providing threshold current and a pulsed current circuit providing drive current. The current applied to the impatt diode by the pulsed curre... | 12/30/1980 |
